Natural Radionuclides and 137Cs Concentrations in Rice in Jepara Residence and Internal Dose Estimation Intake by the People

The measurement of natural radionuclides and 137Cs concentration in rice in Jepara residence and internal dose estimation intake by people have been conducted. The aim of the research is to determine internal dose estimation of natural radionuclides and 137Cs intake by people in Jepara residence. By knowing the natural radionuclides and 137Cs concentrations in rice at Jepara residence, the dose coefficient for adult from ICRP No.72 and the annual intake consumption take from the Indonesian food balance published by BPS, the internal dose from natural radionuclides and 137Cs intake from food can be calculate concentration of 228Th, 226Ra and 137Cs were found in Bayuran, with the average value was (2.00±0.21) x 10-5Bq/kg, (0.09±0.25) x 10-5 Bq/kg, (19.00±0.06) x 10-5 Bq/kg respectively the highest 40K concentration was found in Pandansili with the average was about (8.40 ± 0.34) x 10-5 Bq/kg. The estimation of equivalent doses from intake of 228Th, 226Ra, 40K, and 137Cs in rice were the highest in Bayuran the value the average values, respectively, was 0.0039 x 10-5 μ Sv/yr, 18.09 X 10-5 μ Sv/yr, 1.63 x 10-5 μ Sv/yr, 172.38 x 10-5 μ Sv/yr. Result in this measurement lowest comparing by recommendation IAEA in Safety Series No. 115 in 1996. (author)